Twenty-five years ago, Colorado voters approved the Taxpayer’s Bill of Rights, a constitutional provision that put a spending limit on government and gave voters the power to approve tax hikes. The one-of-a-kind measure, known as TABOR, upended the state’s lawmaking landscape and soon became a political third-rail in the Capitol, one lawmakers touched at their own peril. Now, with mounting state spending needs, two Republican lawmakers are defying the warning. State Rep.